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+# Step 0 — Implementation Detail
+
+1. Added FastAPI application and lifespan initialization in app/main.py.
+2. Added POST /tasks, GET /tasks, GET /tasks/{task_id}, PATCH /tasks/{task_id}, and DELETE /tasks/{task_id} routes.
+3. Added structured RequestValidationError handling and task/database error responses.
+4. Added repository functions for task create, list/filter, fetch, update, and delete.